What are your thoughts on pet Rats and Hamsters?

[Shawn M.]

I have a tenant that asked if I would allow a hamster or a pet rat ( apparently different bread than a rodent rat) I generally have a no pet policy, but only thought of that for dogs and cats. What kind of trouble am I asking for by allowing these small pets? Do you have a pet agreement for them? Can anyone tell me anything about a pet rat? Thank you.